Application Note 1631 Author: Tu Bui 6A Low Quiescent High Efficiency Synchronous Buck Regulator - Small Form Factor Description TABLE 1. BILL OF MATERIALS The ISL8016EVAL2Z kit is intended for use by individuals with requirements for Point-of-Load applications sourcing from 2.7V to 5.8V. The ISL8016EVAL2Z simple smallest factor evaluation board is used for a quick and easy demonstration of the performance of the ISL8016 low quiescent high efficiency synchronous buck regulator. REFERENCE DESIGNATOR DESCRIPTION MFR MFR PART ISL8016EVAL2ZREVAPCB TBD ISL8016EVAL2ZREVAPCB C7 CAP, SMD, 0402, 47pF, 50V, 5%, NPO, ROHS MURATA GRM36COG470J050AQ MURATA C1-C6 The ISL8016 is offered in a 3mmx4mm 20 Ld QFN package with 1mm maximum height. The complete converter occupies 0.15in2 area. CAP, SMD, 1206, 22uF, 6.3V, 20%, X5R, ROHS L1 COIL-PWR INDUCTOR, SMD, 6.9X6.5, 0.68µH, 20%, 5.5A, 5mΩ, ROHS Key Features VO, VIN KEYSTONE 5000 • High Efficiency Synchronous Buck Regulator with up to 97% Efficiency CONN-MINI TEST PT, VERTICAL, RED, ROHS P1, P2 CONN-MINI TEST PT, VERTICAL, BLK, ROHS KEYSTONE 5001 • 0.8% Reference Accuracy Over-Temperature/Load/Line U3 IC-ADJ. 6A BUCK REGULATOR, 20P, QFN, 3X4, ROHS INTERSIL ISL8016IRAJZ R3 RES, SMD, 0402, 0Ω, 1/16W, 5%, TF, ROHS VENKEL H2510-00R00-1/16W-T R2 RES, SMD, 0402, 100k, 1/16W, 1%, TF, ROHS PANASONIC ERJ2RKF1003 R1 RES, SMD, 0402, 200k, 1/16W, 1%, TF, ROHS ROHM R4 RES, SMD, 0402, DNP, DNP, DNP, TF, ROHS • Fixed Output Voltage Option • ±10% Output Voltage Margining • Adjustable Current Limit • Current Sharing Capable • Start-up with Pre-Biased Output • Internal Soft-Start - 1ms or Adjustable • Soft-Stop Output Discharge During Disabled • Adjustable Frequency from 500kHz to 4MHz - Default at 1MHz IHLP2525CZERR68M01 MCR01MZPF2003 • External Synchronization up to 4MHz - Master to Slave Phase Shifting Capability Recommended Equipment The following materials are recommended to perform testing: • 0V to 10V Power Supply with at least 10A source current capability or 5V battery • Electronic Loads capable of sinking current up to 7A • Digital Multimeters (DMMs) • 100MHz quad-trace oscilloscope • Signal generator Quick Setup Guide 1. Ensure that the circuit is correctly connected to the supply and loads prior to applying any power. 2. Connect the bias supply to VIN, the plus terminal to VIN and the negative return to PGND. 3. Connect the output load to VOUT, the plus terminal to VO and the negative return to PGND. 4. Verify the output voltage is 1.8V for VO. March 31, 2011 AN1631.0 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. Copyright Intersil Americas Inc. 2010. All Rights Reserved. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. L1 VIN 7 A 0 2 R3 8 9 10 VIN 1 2 C3 SGND SYNCIN VFB FS VSET ISET SS COMP 12 13 14 15 16 EN 11 OPEN C4 C5 A PGND SYNCOUT R4 2 22UF 22UF 22UF PGND U3 ISL8016IRZ PG VOUT2 0.68UH PGND LX LX LX VIN VIN EP P1 3 6 22UF 4 C2 21 C1 22UF 5 VIN 1 20 19 18 R1 200K R2 VO C6 22UF P2 C7 47PF A 100K 17 A Application Note 1631 VIN A FIGURE 1. ISL8016EVAL2Z SCHEMATIC AN1631.0 FIGURE 2. TOP COMPONENTS FIGURE 3. BOTTOM SILK SCREEN